[daip] [!6539]: aips - SPLIT -missing scan

[Gabriela Castelletti]

Gabriela Castelletti updated #6539
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SPLIT -missing scan
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           Ticket ID: 6539
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/6539



To whom it may concern,

I have got some problems to split out the target source from the multi-source file. Concretely, there are 12 scans on the target in the 
multi-source file, however, the output split file has only 11 scans on the target. I am missing the last scan on the target. 
I have made several proofs to understand what the problem is. I found, for example, that if SPLIT runs with docal=-1, the output 
file has the 12 required scans. The easy conclusion is that there is an issue in applying the calibration, although I do not understand what is wrong. 
Maybe it is important to mention that the data were obtained with GMRT.

Below, I transcribed the inputs used in SPLIT, with docal=1 gainuse=2 (to apply the CL2 created in the multi-source file). The output SPLIT file created with these inputs has only 11 scans on the target:
**SPLIT**
INNAME     '21Mar_SF_29'     
INCLASS    'SPLAT'              
INSEQ         1                    INDISK        1              
SOURCES    'J1843-033C'            *rest ' ' 
QUAL         -1                 
CALCODE    ' '              
TIMERANG   *all 0         
STOKES     ' '          
SELBAND      -1                
SELFREQ      -1    
FREQID       -1        
BIF           0                     
EIF           0             
BCHAN         0                    
ECHAN         0       
SUBARRAY      0             
DOCALIB       1                  
GAINUSE       2          
DOPOL        -1                    
PDVER         0        
BLVER        -1
FLAGVER       3          
DOBAND       -1                  
BPVER         0                 
SMOOTH     *all 0          
OUTCLASS   ' '                   
OUTSEQ        0                   
OUTDISK       1                   
DOUVCOMP     -1
APARM      *all 0
NCHAV         0
CHINC         0 
ICHANSEL   *all 0   
BADDISK    *all 0


By using listr, the scans on source J1843-033C (the target) in the SPLIT file are:
Scan      Source      Qual  Calcode Sub         Timerange          FrqID   START VIS  END VIS
   1 J1843-03        : 0000           1  0/22:36:36 -   0/23:06:32     1       1      84316
   2 J1843-03        : 0000           1  0/23:18:53 -   0/23:48:57     1   84317     169098
   3 J1843-03        : 0000           1  1/00:01:42 -   1/00:31:46     1  169099     253923
   4 J1843-03        : 0000           1  1/00:42:30 -   1/01:12:34     1  253924     338131
   5 J1843-03        : 0000           1  1/01:23:18 -   1/01:53:22     1  338132     417012
   6 J1843-03        : 0000           1  1/02:03:50 -   1/02:33:46     1  417013     499336
   7 J1843-03        : 0000           1  1/02:44:14 -   1/03:14:18     1  499337     583222
   8 J1843-03        : 0000           1  1/03:24:54 -   1/03:55:22     1  583223     667986
   9 J1843-03        : 0000           1  1/04:06:06 -   1/04:36:02     1  667987     750406
  10 J1843-03        : 0000           1  1/04:50:16 -   1/05:20:20     1  750407     834541
  11 J1843-03        : 0000           1  1/05:31:52 -   1/05:47:18     1  834542     874859

I lost the last scan on the target, which in the multi-source file is: 
	Source      Qual  Calcode Sub         Timerange          FrqID   START VIS  END VIS
    J1843-033C      : 0000            1  1/05:56:42 -   1/06:37:06     1 1096978    1211133

Just in case, the inputs used in CLCAL were important: 
**CLCAL**
INNAME     '21Marc_SF_24'           
INCLASS    'SPLAT'          
INSEQ         1          
INDISK        1                    
SOURCES    'J1843-033C'     *rest ' ' 
SOUCODE    ' '           
CALSOUR    '1822-096'        *rest ' ' 
QUAL         -1                                 
CALCODE    ' '                  
TIMERANG   *all 0     
SUBARRAY      0                    
ANTENNAS   *all 0  
SELBAND      -1                             
SELFREQ      -1                
FREQID       -1 
OPCODE     'CALI'                        
INTERPOL   'SIMP' 
CUTOFF        0                              
SAMPTYPE   ' '      
BPARM      *all 0                            
ICUT          0.1                   
DOBLANK       0         
DOBTWEEN      1                    
SMOTYPE    ' '    
SNVER         1                        
INVERS        2   
GAINVER       1  
GAINUSE       2                             
REFANT       15                          

I would appreciate your help to solve this apparent problem,
Thanks a lot,
Best Regards,
Gabriela Castelletti

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